'A killer is among them' states the new EastEnders promo, but show boss Dominic Treadwell-Collins has revealed that one Walford regular definitely isn't responsible for murdering Lucy Beale.

"Who didn't do it? Stacey. She's not around. That's not that helpful, is it?" laughs the executive producer in a new behind-the-scenes video.

As loyal fans are aware, Stacey (Lacey Turner) is currently languishing behind bars after confessing to the murder of Archie Mitchell. But viewers can now be definitely sure that she didn't mastermind the killing from her prison cell!

For more titbits and filming secrets about how Lucy met her maker - including interviews with Adam Woodyatt (Ian) and Hetti Bywater (Lucy) - click the video below: